There is no portable std::abs overload for int64_t, use the llvm::abs64
which exists for this purpose.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154199 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index c20ee67..a5b0245 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -8616,9 +8616,9 @@
 bool ARMTargetLowering::isLegalICmpImmediate(int64_t Imm) const {
   // Thumb2 and ARM modes can use cmn for negative immediates.
   if (!Subtarget->isThumb())
-    return ARM_AM::getSOImmVal(std::abs(Imm)) != -1;
+    return ARM_AM::getSOImmVal(llvm::abs64(Imm)) != -1;
   if (Subtarget->isThumb2())
-    return ARM_AM::getT2SOImmVal(std::abs(Imm)) != -1;
+    return ARM_AM::getT2SOImmVal(llvm::abs64(Imm)) != -1;
   // Thumb1 doesn't have cmn, and only 8-bit immediates.
   return Imm >= 0 && Imm <= 255;
 }