Merge pull request #9887 from ethereum/evmhost

EVMHost: keep precompile balance/settings across resets

test/libsolidity/semanticTests/various/codebalance_assembly.sol

@@ -0,0 +1,28 @@
+contract C {
+    constructor() payable {}
+
+    function f() public returns (uint256 ret) {
+        assembly {
+            ret := balance(0)
+        }
+    }
+    function g() public returns (uint256 ret) {
+        assembly {
+            ret := balance(1)
+        }
+    }
+    function h() public returns (uint256 ret) {
+        assembly {
+            ret := balance(address())
+        }
+    }
+}
+
+// ====
+// EVMVersion: >=constantinople
+// compileViaYul: also
+// ----
+// constructor(), 23 wei ->
+// f() -> 0
+// g() -> 1
+// h() -> 23

test/libsolidity/semanticTests/various/codehash_assembly.sol

@@ -0,0 +1,25 @@
+contract C {
+    function f() public returns (bytes32 ret) {
+        assembly {
+            ret := extcodehash(0)
+        }
+    }
+    function g() public returns (bytes32 ret) {
+        assembly {
+            ret := extcodehash(1)
+        }
+    }
+    function h() public returns (bool ret) {
+        assembly {
+            ret := iszero(iszero(extcodehash(address())))
+        }
+    }
+}
+
+// ====
+// EVMVersion: >=constantinople
+// compileViaYul: also
+// ----
+// f() -> 0
+// g() -> 0xc5d2460186f7233c927e7db2dcc703c0e500b653ca82273b7bfad8045d85a470
+// h() -> true