Add inlining for old optimizer.

test/libsolidity/gasTests/abiv2_optimised.sol

@@ -17,13 +17,13 @@ contract C {
 // optimize-yul: true
 // ----
 // creation:
-//   codeDepositCost: 588800
+//   codeDepositCost: 583400
 //   executionCost: 619
-//   totalCost: 589419
+//   totalCost: 584019
 // external:
-//   a(): 1029
-//   b(uint256): 2084
-//   f1(uint256): 351
+//   a(): 985
+//   b(uint256): 2052
+//   f1(uint256): 307
 //   f2(uint256[],string[],uint16,address): infinite
 //   f3(uint16[],string[],uint16,address): infinite
 //   f4(uint32[],string[12],bytes[2][],address): infinite

test/libsolidity/gasTests/dispatch_large_optimised.sol

@@ -27,29 +27,29 @@ contract Large {
 // optimize-runs: 2
 // ----
 // creation:
-//   codeDepositCost: 270600
-//   executionCost: 312
-//   totalCost: 270912
+//   codeDepositCost: 267000
+//   executionCost: 306
+//   totalCost: 267306
 // external:
-//   a(): 1028
-//   b(uint256): 2370
-//   f0(uint256): 399
-//   f1(uint256): 41539
-//   f2(uint256): 21605
-//   f3(uint256): 21693
-//   f4(uint256): 21671
-//   f5(uint256): 21649
-//   f6(uint256): 21561
-//   f7(uint256): 21341
-//   f8(uint256): 21473
-//   f9(uint256): 21495
-//   g0(uint256): 639
-//   g1(uint256): 41251
-//   g2(uint256): 21339
-//   g3(uint256): 21427
-//   g4(uint256): 21405
-//   g5(uint256): 21493
-//   g6(uint256): 21273
-//   g7(uint256): 21383
-//   g8(uint256): 21361
-//   g9(uint256): 21207
+//   a(): 983
+//   b(uint256): 2337
+//   f0(uint256): 366
+//   f1(uint256): 41506
+//   f2(uint256): 21572
+//   f3(uint256): 21660
+//   f4(uint256): 21638
+//   f5(uint256): 21616
+//   f6(uint256): 21528
+//   f7(uint256): 21308
+//   f8(uint256): 21440
+//   f9(uint256): 21462
+//   g0(uint256): 606
+//   g1(uint256): 41218
+//   g2(uint256): 21306
+//   g3(uint256): 21394
+//   g4(uint256): 21372
+//   g5(uint256): 21460
+//   g6(uint256): 21240
+//   g7(uint256): 21350
+//   g8(uint256): 21328
+//   g9(uint256): 21174

test/libsolidity/gasTests/dispatch_medium_optimised.sol

@@ -14,16 +14,16 @@ contract Medium {
 // optimize-runs: 2
 // ----
 // creation:
-//   codeDepositCost: 161000
-//   executionCost: 208
-//   totalCost: 161208
+//   codeDepositCost: 157400
+//   executionCost: 202
+//   totalCost: 157602
 // external:
-//   a(): 1028
-//   b(uint256): 2128
-//   f1(uint256): 41319
-//   f2(uint256): 21363
-//   f3(uint256): 21407
-//   g0(uint256): 397
-//   g7(uint256): 21273
-//   g8(uint256): 21251
-//   g9(uint256): 21207
+//   a(): 983
+//   b(uint256): 2095
+//   f1(uint256): 41286
+//   f2(uint256): 21330
+//   f3(uint256): 21374
+//   g0(uint256): 364
+//   g7(uint256): 21240
+//   g8(uint256): 21218
+//   g9(uint256): 21174

test/libsolidity/gasTests/dispatch_small_optimised.sol

@@ -9,11 +9,11 @@ contract Small {
 // optimize-runs: 2
 // ----
 // creation:
-//   codeDepositCost: 76200
+//   codeDepositCost: 72600
 //   executionCost: 123
-//   totalCost: 76323
+//   totalCost: 72723
 // external:
 //   fallback: 118
-//   a(): 1006
-//   b(uint256): 2018
-//   f1(uint256): 41253
+//   a(): 961
+//   b(uint256): 1985
+//   f1(uint256): 41220

test/libsolidity/gasTests/exp_optimized.sol

@@ -19,11 +19,11 @@ contract C {
 // optimize-yul: true
 // ----
 // creation:
-//   codeDepositCost: 53200
-//   executionCost: 105
-//   totalCost: 53305
+//   codeDepositCost: 47800
+//   executionCost: 99
+//   totalCost: 47899
 // external:
-//   exp_neg_one(uint256): 1962
-//   exp_one(uint256): 1915
-//   exp_two(uint256): 1893
-//   exp_zero(uint256): 1937
+//   exp_neg_one(uint256): 1917
+//   exp_one(uint256): 1870
+//   exp_two(uint256): 1848
+//   exp_zero(uint256): 1892