Honor user-defined section specification of a global, ignores whether its initializer is null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@42182 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp
index 8584049..c4d5958 100644
--- a/lib/Target/X86/X86AsmPrinter.cpp
+++ b/lib/Target/X86/X86AsmPrinter.cpp
@@ -170,7 +170,7 @@
     if (Subtarget->isTargetELF())
       O << "\t.type\t" << name << ",@object\n";
     
-    if (C->isNullValue()) {
+    if (C->isNullValue() && !I->hasSection()) {
       if (I->hasExternalLinkage()) {
         if (const char *Directive = TAI->getZeroFillDirective()) {
           O << "\t.globl\t" << name << "\n";
@@ -180,7 +180,7 @@
         }
       }
       
-      if (!I->hasSection() && !I->isThreadLocal() &&
+      if (!I->isThreadLocal() &&
           (I->hasInternalLinkage() || I->hasWeakLinkage() ||
            I->hasLinkOnceLinkage())) {
         if (Size == 0) Size = 1;   // .comm Foo, 0 is undefined, avoid it.