Adds support for the EVM version "Paris".

Deprecates `block.difficulty` and disallow `difficulty()` in inline assembly for EVM versions >= paris.
The change is due to the renaming introduced by EIP-4399 (see: https://eips.ethereum.org/EIPS/eip-4399).
Introduces `block.prevrandao` in Solidity and `prevrandao()` in inline assembly for EVM versions >= paris.

Co-authored-by: Alex Beregszaszi <alex@rtfs.hu>
Co-authored-by: Daniel <daniel@ekpyron.org>
Co-authored-by: matheusaaguiar <95899911+matheusaaguiar@users.noreply.github.com>
Co-authored-by: Nikola Matić <nikola.matic@ethereum.org>

test/cmdlineTests/evmasm_difficulty_post_paris/args

@@ -0,0 +1 @@
+--no-cbor-metadata --via-ir --optimize --opcodes --asm --debug-info none --evm-version paris

test/cmdlineTests/evmasm_difficulty_post_paris/err

@@ -0,0 +1,5 @@
+Warning: Since the VM version paris, "difficulty" was replaced by "prevrandao", which now returns a random number based on the beacon chain.
+ --> evmasm_difficulty_post_paris/input.sol:6:21:
+  |
+6 |         uint256 x = block.difficulty;
+  |                     ^^^^^^^^^^^^^^^^

test/cmdlineTests/evmasm_difficulty_post_paris/input.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0.0;
+
+contract C {
+    constructor() payable {
+        uint256 x = block.difficulty;
+        assembly {
+            sstore(0, x)
+            stop()
+        }
+    }
+
+    fallback() external payable {
+        assembly {
+            stop()
+        }
+    }
+}

test/cmdlineTests/evmasm_difficulty_post_paris/output

@@ -0,0 +1,13 @@
+
+======= evmasm_difficulty_post_paris/input.sol:C =======
+EVM assembly:
+  sstore(0x00, prevrandao)
+  stop
+stop
+
+sub_0: assembly {
+      stop
+}
+
+Opcodes:
+PREVRANDAO PUSH1 0x0 SSTORE STOP INVALID 

test/cmdlineTests/evmasm_difficulty_pre_paris/args

@@ -0,0 +1 @@
+--no-cbor-metadata --via-ir --optimize --opcodes --asm --debug-info none --evm-version london

test/cmdlineTests/evmasm_difficulty_pre_paris/input.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0.0;
+
+contract C {
+    constructor() payable {
+        uint256 x = block.difficulty;
+        assembly {
+            sstore(0, x)
+            stop()
+        }
+    }
+
+    fallback() external payable {
+        assembly {
+            stop()
+        }
+    }
+}

test/cmdlineTests/evmasm_difficulty_pre_paris/output

@@ -0,0 +1,13 @@
+
+======= evmasm_difficulty_pre_paris/input.sol:C =======
+EVM assembly:
+  sstore(0x00, difficulty)
+  stop
+stop
+
+sub_0: assembly {
+      stop
+}
+
+Opcodes:
+DIFFICULTY PUSH1 0x0 SSTORE STOP INVALID 

test/cmdlineTests/evmasm_prevrandao_post_paris/args

@@ -0,0 +1 @@
+--no-cbor-metadata --via-ir --optimize --opcodes --asm --debug-info none --evm-version paris

test/cmdlineTests/evmasm_prevrandao_post_paris/input.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0.0;
+
+contract C {
+    constructor() payable {
+        uint256 x = block.prevrandao;
+        assembly {
+            sstore(0, x)
+            stop()
+        }
+    }
+
+    fallback() external payable {
+        assembly {
+            stop()
+        }
+    }
+}

test/cmdlineTests/evmasm_prevrandao_post_paris/output

@@ -0,0 +1,13 @@
+
+======= evmasm_prevrandao_post_paris/input.sol:C =======
+EVM assembly:
+  sstore(0x00, prevrandao)
+  stop
+stop
+
+sub_0: assembly {
+      stop
+}
+
+Opcodes:
+PREVRANDAO PUSH1 0x0 SSTORE STOP INVALID 

test/cmdlineTests/evmasm_prevrandao_pre_paris/args

@@ -0,0 +1 @@
+--no-cbor-metadata --via-ir --optimize --opcodes --asm --debug-info none --evm-version london

test/cmdlineTests/evmasm_prevrandao_pre_paris/err

@@ -0,0 +1,5 @@
+Warning: "prevrandao" is not supported by the VM version and will be treated as "difficulty".
+ --> evmasm_prevrandao_pre_paris/input.sol:6:21:
+  |
+6 |         uint256 x = block.prevrandao;
+  |                     ^^^^^^^^^^^^^^^^

test/cmdlineTests/evmasm_prevrandao_pre_paris/input.sol

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0.0;
+
+contract C {
+    constructor() payable {
+        uint256 x = block.prevrandao;
+        assembly {
+            sstore(0, x)
+            stop()
+        }
+    }
+
+    fallback() external payable {
+        assembly {
+            stop()
+        }
+    }
+}

test/cmdlineTests/evmasm_prevrandao_pre_paris/output

@@ -0,0 +1,13 @@
+
+======= evmasm_prevrandao_pre_paris/input.sol:C =======
+EVM assembly:
+  sstore(0x00, difficulty)
+  stop
+stop
+
+sub_0: assembly {
+      stop
+}
+
+Opcodes:
+DIFFICULTY PUSH1 0x0 SSTORE STOP INVALID