Satisfy sub-optimal GCC warning.

(Clang doesn't warn here because it knows the string is benign - the
assert still checks what it's intended to - though putting the correct
parens does make clang-format format the code a little better)

llvm-svn: 207456

llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

@@ -590,10 +590,10 @@ std::unique_ptr<DIE> DwarfDebug::constructScopeDIE(DwarfCompileUnit &TheCU,
 
   DIScope DS(Scope->getScopeNode());
 
-  assert(Scope->getInlinedAt() ||
-         (!DS.isSubprogram() && "Only handle inlined subprograms here, use "
+  assert((Scope->getInlinedAt() || !DS.isSubprogram()) &&
+         "Only handle inlined subprograms here, use "
          "constructSubprogramScopeDIE for non-inlined "
-                                "subprograms"));
+         "subprograms");
 
   SmallVector<std::unique_ptr<DIE>, 8> Children;