Add inlining for old optimizer.

test/cmdlineTests/optimizer_inliner_inc/args

@@ -0,0 +1 @@
+--optimize --asm --metadata-hash none

test/cmdlineTests/optimizer_inliner_inc/input.sol

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-3.0
+pragma solidity >=0.0;
+
+function unsafe_inc(uint x) pure returns (uint)
+{
+    unchecked {
+        return x + 1;
+    }
+}
+
+contract C {
+    function f() public pure {
+        for(uint x = 0; x < 10; x = unsafe_inc(x))
+        {
+        }
+    }
+}

test/cmdlineTests/optimizer_inliner_inc/output

@@ -0,0 +1,83 @@
+
+======= optimizer_inliner_inc/input.sol:C =======
+EVM assembly:
+    /* "optimizer_inliner_inc/input.sol":157:279  contract C {... */
+  mstore(0x40, 0x80)
+  callvalue
+  dup1
+  iszero
+  tag_1
+  jumpi
+  0x00
+  dup1
+  revert
+tag_1:
+  pop
+  dataSize(sub_0)
+  dup1
+  dataOffset(sub_0)
+  0x00
+  codecopy
+  0x00
+  return
+stop
+
+sub_0: assembly {
+        /* "optimizer_inliner_inc/input.sol":157:279  contract C {... */
+      mstore(0x40, 0x80)
+      callvalue
+      dup1
+      iszero
+      tag_1
+      jumpi
+      0x00
+      dup1
+      revert
+    tag_1:
+      pop
+      jumpi(tag_2, lt(calldatasize, 0x04))
+      shr(0xe0, calldataload(0x00))
+      dup1
+      0x26121ff0
+      eq
+      tag_3
+      jumpi
+    tag_2:
+      0x00
+      dup1
+      revert
+        /* "optimizer_inliner_inc/input.sol":174:277  function f() public pure {... */
+    tag_3:
+      tag_4
+      tag_5
+      jump	// in
+    tag_4:
+      stop
+    tag_5:
+        /* "optimizer_inliner_inc/input.sol":213:219  uint x */
+      0x00
+        /* "optimizer_inliner_inc/input.sol":209:271  for(uint x = 0; x < 10; x = unsafe_inc(x))... */
+    tag_7:
+        /* "optimizer_inliner_inc/input.sol":229:231  10 */
+      0x0a
+        /* "optimizer_inliner_inc/input.sol":225:226  x */
+      dup2
+        /* "optimizer_inliner_inc/input.sol":225:231  x < 10 */
+      lt
+        /* "optimizer_inliner_inc/input.sol":209:271  for(uint x = 0; x < 10; x = unsafe_inc(x))... */
+      iszero
+      tag_8
+      jumpi
+        /* "optimizer_inliner_inc/input.sol":145:146  1 */
+      0x01
+        /* "optimizer_inliner_inc/input.sol":141:146  x + 1 */
+      add
+        /* "optimizer_inliner_inc/input.sol":209:271  for(uint x = 0; x < 10; x = unsafe_inc(x))... */
+      jump(tag_7)
+    tag_8:
+      pop
+        /* "optimizer_inliner_inc/input.sol":174:277  function f() public pure {... */
+      jump	// out
+
+    auxdata: <AUXDATA REMOVED>
+}