Return a StringRef from getSection.

This is similar to how getName is handled.

llvm-svn: 269218
diff --git a/llvm/lib/IR/Core.cpp b/llvm/lib/IR/Core.cpp
index d69e8d5..0c6c6f5 100644
--- a/llvm/lib/IR/Core.cpp
+++ b/llvm/lib/IR/Core.cpp
@@ -1485,7 +1485,9 @@
 }
 
 const char *LLVMGetSection(LLVMValueRef Global) {
-  return unwrap<GlobalValue>(Global)->getSection();
+  // Using .data() is safe because of how GlobalObject::setSection is
+  // implemented.
+  return unwrap<GlobalValue>(Global)->getSection().data();
 }
 
 void LLVMSetSection(LLVMValueRef Global, const char *Section) {