[AsmPrinter] Replace a reachable report_fatal_error with MCContext::reportError

Author: MaskRay

llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -534,8 +534,8 @@ void AsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
 
   GVSym->redefineIfPossible();
   if (GVSym->isDefined() || GVSym->isVariable())
-    report_fatal_error("symbol '" + Twine(GVSym->getName()) +
-                       "' is already defined");
+    OutContext.reportError(SMLoc(), "symbol '" + Twine(GVSym->getName()) +
+                                        "' is already defined");
 
   if (MAI->hasDotTypeDotSizeDirective())
     OutStreamer->emitSymbolAttribute(EmittedSym, MCSA_ELF_TypeObject);

llvm/test/CodeGen/X86/equiv_with_vardef.ll

@@ -1,8 +1,9 @@
-; RUN: not --crash llc < %s 2>&1 | FileCheck %s
+; RUN: not llc -filetype=null %s 2>&1 | FileCheck %s
 target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
 target triple = "x86_64-unknown-linux-gnu"
 
 module asm ".equiv var, __var"
 
 @var = global i32 0
-; CHECK: symbol 'var' is already defined
+; CHECK: <unknown>:0: error: symbol 'var' is already defined
+; CHECK: <unknown>:0: error: invalid symbol redefinition