[PowerPC] Fix conditions of assert in PPCAsmPrinter

[jsji]

Summary

g++ build emits warning:

llvm/lib/Target/PowerPC/PPCAsmPrinter.cpp:667:77: error: suggest parentheses around ?&&? within ?||? [-Werror=parentheses]

assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress() &&
                                                    ~~~~~~~~~~~~~~~~~~~~^~
       "Unexpected operand type for LWZtoc pseudo.");

I believe the intension is to assert all different types,
so we should add a parentheses to include all '||'.

[Xiangling_L]

LGTM. Thank you Jinsong for putting up this patch. I found this warning as well, and I was planning to fix it in one of my PR which is also related to Sean's lowering work and will be landed in the future. But it's certainly nice to have this fixed earlier.

llvm/trunk/lib/Target/PowerPC/PPCAsmPrinter.cpp

case PPC::LWZtoc: {
 
     // Transform %rN = LWZtoc @op1, %r2
     LowerPPCMachineInstrToMCInst(MI, TmpInst, *this, isDarwin);
 
     // Change the opcode to LWZ.
     TmpInst.setOpcode(PPC::LWZ);
 
     const MachineOperand &MO = MI->getOperand(1);
-    assert(MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress() &&
+    assert((MO.isGlobal() || MO.isCPI() || MO.isJTI() || MO.isBlockAddress()) &&
            "Unexpected operand type for LWZtoc pseudo.");
 
     // Map the operand to its corresponding MCSymbol.
     MCSymbol *MOSymbol = nullptr;
     if (MO.isGlobal())
       MOSymbol = getSymbol(MO.getGlobal());
     else if (MO.isCPI())
       MOSymbol = GetCPISymbol(MO.getIndex());