Fixing tests on breaking branch.

test/libsolidity/semanticTests/functionCall/calling_nonexisting_contract_throws.sol

@@ -22,6 +22,8 @@ contract C {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // f() -> FAILURE
 // g() -> FAILURE

test/libsolidity/semanticTests/functionCall/gas_and_value_basic.sol

@@ -37,6 +37,8 @@ contract test {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // constructor(), 20 wei ->
 // sendAmount(uint256): 5 -> 5

test/libsolidity/semanticTests/intheritance/value_for_constructor.sol

@@ -38,6 +38,8 @@ contract Main {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // constructor(), 22 wei ->
 // getFlag() -> true

test/libsolidity/semanticTests/various/value_complex.sol

@@ -18,6 +18,8 @@ contract test {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // constructor(), 20 wei ->
 // sendAmount(uint256): 5 -> 8

test/libsolidity/semanticTests/various/value_insane.sol

@@ -17,6 +17,8 @@ contract test {
     }
 }
 
+// ====
+// compileViaYul: also
 // ----
 // constructor(), 20 wei ->
 // sendAmount(uint256): 5 -> 8

test/libsolidity/syntaxTests/missing_functions_duplicate_bug.sol

@@ -1,5 +1,3 @@
-pragma solidity ^0.6.0;
-
 pragma experimental ABIEncoderV2;
 
 contract Ownable {
@@ -25,4 +23,4 @@ contract Voting is Ownable {
     }
 }
 // ----
-// Warning: (324-340): Unused function parameter. Remove or comment out the variable name to silence this warning.
+// Warning: (299-315): Unused function parameter. Remove or comment out the variable name to silence this warning.