[test] Update tests to include location string.

test/libsolidity/syntaxTests/revertStatement/at_file_level.sol

@@ -1,3 +1,3 @@
 revert X();
 // ----
-// ParserError 2314: (8-9): Expected ';' but got '('
+// ParserError 2314: (8-9='('): Expected ';' but got '('

test/libsolidity/syntaxTests/revertStatement/error_used_elsewhere.sol

@@ -3,4 +3,4 @@ function f() pure {
     E();
 }
 // ----
-// TypeError 7757: (35-38): Errors can only be used with revert statements: "revert MyError();".
+// TypeError 7757: (35-38='E()'): Errors can only be used with revert statements: "revert MyError();".

test/libsolidity/syntaxTests/revertStatement/non_called.sol

@@ -3,4 +3,4 @@ function f() public pure {
     revert E;
 }
 // ----
-// ParserError 2314: (50-51): Expected '(' but got ';'
+// ParserError 2314: (50-51=';'): Expected '(' but got ';'

test/libsolidity/syntaxTests/revertStatement/non_error.sol

@@ -2,4 +2,4 @@ function f() public pure {
     revert 1;
 }
 // ----
-// ParserError 2314: (38-39): Expected ';' but got 'Number'
+// ParserError 2314: (38-39='1'): Expected ';' but got 'Number'

test/libsolidity/syntaxTests/revertStatement/revert_event.sol

@@ -5,4 +5,4 @@ contract C {
     }
 }
 // ----
-// TypeError 1885: (74-75): Expression has to be an error.
+// TypeError 1885: (74-75='E'): Expression has to be an error.

test/libsolidity/syntaxTests/revertStatement/revert_revert.sol

@@ -5,4 +5,4 @@ contract C {
     }
 }
 // ----
-// Warning 2319: (0-15): This declaration shadows a builtin symbol.
+// Warning 2319: (0-15='error revert();'): This declaration shadows a builtin symbol.

test/libsolidity/syntaxTests/revertStatement/using_function.sol

@@ -6,4 +6,4 @@ contract C {
 }
 // ----
 // Warning 2519: (38-91): This declaration shadows an existing declaration.
-// TypeError 1885: (79-80): Expression has to be an error.
+// TypeError 1885: (79-80='f'): Expression has to be an error.

test/libsolidity/syntaxTests/revertStatement/using_struct.sol

@@ -5,4 +5,4 @@ contract C {
     }
 }
 // ----
-// TypeError 1885: (75-76): Expression has to be an error.
+// TypeError 1885: (75-76='S'): Expression has to be an error.