[mips] [IAS] Add missing constraints and improve testing for the .module directive.

Summary:
None of the .set directives can be used before the .module directives. The .set mips0/pop/push were not triggering this constraint.
Also added testing for all the other implemented directives which are supposed to trigger this constraint.

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7140

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231465 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/Mips/AsmParser/MipsAsmParser.cpp

@@ -236,6 +236,8 @@ class MipsAsmParser : public MCTargetAsmParser {
   bool parseFpABIValue(MipsABIFlagsSection::FpABIKind &FpABI,
                        StringRef Directive);
 
+  bool parseInternalDirectiveReallowModule();
+
   MCSymbolRefExpr::VariantKind getVariantKind(StringRef Symbol);
 
   bool eatComma(StringRef ErrorStr);
@@ -4429,9 +4431,25 @@ bool MipsAsmParser::ParseDirective(AsmToken DirectiveID) {
   if (IDVal == ".module")
     return parseDirectiveModule();
 
+  if (IDVal == ".llvm_internal_mips_reallow_module_directive")
+    return parseInternalDirectiveReallowModule();
+
   return true;
 }
 
+bool MipsAsmParser::parseInternalDirectiveReallowModule() {
+  // If this is not the end of the statement, report an error.
+  if (getLexer().isNot(AsmToken::EndOfStatement)) {
+    reportParseError("unexpected token, expected end of statement");
+    return false;
+  }
+
+  getTargetStreamer().reallowModuleDirective();
+
+  getParser().Lex(); // Eat EndOfStatement token.
+  return false;
+}
+
 extern "C" void LLVMInitializeMipsAsmParser() {
   RegisterMCAsmParser<MipsAsmParser> X(TheMipsTarget);
   RegisterMCAsmParser<MipsAsmParser> Y(TheMipselTarget);