Builbot Failure fix:

1. Using 64-bit virtual register instead of 32-bit in SystemZISelLowering.cpp for -mbackchain option. -verify-machineinstrs option exposed it.
2. Adding -verify-machineinstrs option to run llvm tests.
3. Using %clang_cc1 instead of %clang for clang test failure.
4. Fix issue with unused variable being used in assert().

Author: anoopkg6

clang/test/CodeGen/SystemZ/builtin-setjmp-logjmp.c

@@ -1,7 +1,8 @@
 // NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --version 5
-// RUN: %clang --target=s390x-linux -S -emit-llvm -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple s390x-linux -emit-llvm -o - %s | FileCheck %s
 
 void *buf[20];
+
 // CHECK-LABEL: define dso_local void @foo(
 // CHECK-SAME: ) #[[ATTR0:[0-9]+]] {
 // CHECK-NEXT:  [[ENTRY:.*:]]

llvm/lib/Target/SystemZ/SystemZISelLowering.cpp

@@ -961,6 +961,7 @@ SystemZTargetLowering::emitEHSjLjSetJmp(MachineInstr &MI,
   Register DstReg = MI.getOperand(0).getReg();
   const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
   assert(TRI->isTypeLegalForClass(*RC, MVT::i32) && "Invalid destination!");
+  (void)TRI;
   Register mainDstReg = MRI.createVirtualRegister(RC);
   Register restoreDstReg = MRI.createVirtualRegister(RC);
 
@@ -1059,7 +1060,7 @@ SystemZTargetLowering::emitEHSjLjSetJmp(MachineInstr &MI,
   // Slot 3(Offset = 2) Backchain value (if building with -mbackchain).
   bool BackChain = MF->getSubtarget<SystemZSubtarget>().hasBackChain();
   if (BackChain) {
-    Register BCReg = MRI.createVirtualRegister(RC);
+    Register BCReg = MRI.createVirtualRegister(PtrRC);
     auto *TFL = Subtarget.getFrameLowering<SystemZFrameLowering>();
     MIB = BuildMI(*thisMBB, MI, DL, TII->get(SystemZ::LG), BCReg)
               .addReg(SpecialRegs->getStackPointerRegister())

llvm/test/CodeGen/SystemZ/builtin-longjmp.ll

@@ -6,6 +6,8 @@
 ; Stack Pointer from Slot 4.
 ; Literal Pool Pointer from Slot 5.
 
+; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu | FileCheck %s
+
 ; RUN: llc < %s -mtriple=s390x-linux-gnu -O2 | FileCheck %s
 
 @buf = global [20 x ptr] zeroinitializer, align 8

llvm/test/CodeGen/SystemZ/builtin-setjmp-alloca.ll

@@ -7,6 +7,8 @@
 ; Stack Pointer in slot 4.
 ; Clobber %r6-%r15, %f8-%f15.
 
+; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu | FileCheck %s
+
 ; RUN: llc < %s -mtriple=s390x-linux-gnu -O2 | FileCheck %s
 
 declare i32 @llvm.eh.sjlj.setjmp(ptr)

llvm/test/CodeGen/SystemZ/builtin-setjmp-spills.ll

@@ -7,6 +7,8 @@
 ; Stack Pointer in slot 4.
 ; Clobber %r6-%r15, %f8-%f15.
 
+; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu | FileCheck %s
+
 ; RUN: llc < %s -mtriple=s390x-linux-gnu -O3 | FileCheck %s
 
 declare i32 @llvm.eh.sjlj.setjmp(ptr)

llvm/test/CodeGen/SystemZ/builtin-setjmp.ll

@@ -5,6 +5,8 @@
 ; Stack Pointer in slot 4.
 ; Clobber %r6-%r15, %f8-%f15.
 
+; RUN: llc < %s -verify-machineinstrs -mtriple=s390x-linux-gnu | FileCheck %s
+
 ; RUN: llc < %s -mtriple=s390x-linux-gnu -O2 | FileCheck %s
 
 declare i32 @llvm.eh.sjlj.setjmp(ptr)