Update Dart.g & Dart.g4 to match newest version of spec

Change-Id: I10a0527577439cb9ea1d94d60b31703995d7f6b9
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/397905
Commit-Queue: Erik Ernst <[email protected]>
Auto-Submit: Erik Ernst <[email protected]>
Reviewed-by: Chloe Stefantsova <[email protected]>
Commit-Queue: Chloe Stefantsova <[email protected]>

Author: eernstg

tools/spec_parser/Dart.g

@@ -683,7 +683,6 @@ primary
     |    '(' expression ')'
     |    constructorTearoff
     |    switchExpression
-    |    staticMemberShorthand
     ;
 
 constructorInvocation
@@ -800,8 +799,12 @@ switchExpressionCase
     ;
 
 staticMemberShorthand
-    :    '.' identifierOrNew selector*
-    |    CONST '.' identifierOrNew selector*
+    :    staticMemberShorthandHead selector*
+    ;
+
+staticMemberShorthandHead
+    :    '.' identifierOrNew
+    |    CONST '.' identifierOrNew arguments
     ;
 
 throwExpression
@@ -1037,6 +1040,7 @@ awaitExpression
 postfixExpression
     :    assignableExpression postfixOperator
     |    primary selector*
+    |    staticMemberShorthand
     ;
 
 postfixOperator

tools/spec_parser/dart_spec_parser/Dart.g4

@@ -689,7 +689,6 @@ primary
     |    '(' expression ')'
     |    constructorTearoff
     |    switchExpression
-    |    staticMemberShorthand
     ;
 
 constructorInvocation
@@ -806,8 +805,12 @@ switchExpressionCase
     ;
 
 staticMemberShorthand
-    :    '.' identifierOrNew selector*
-    |    CONST '.' identifierOrNew selector*
+    :    staticMemberShorthandHead selector*
+    ;
+
+staticMemberShorthandHead
+    :    '.' identifierOrNew
+    |    CONST '.' identifierOrNew arguments
     ;
 
 throwExpression
@@ -1043,6 +1046,7 @@ awaitExpression
 postfixExpression
     :    assignableExpression postfixOperator
     |    primary selector*
+    |    staticMemberShorthand
     ;
 
 postfixOperator