PPC/s390: remove unused macro to fix compilation error

Change-Id: Id2ba591deb39428d9c788a9c9dcfd15bb8581bd0
Reviewed-on: https://chromium-review.googlesource.com/1205330Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Commit-Queue: Junliang Yan <jyan@ca.ibm.com>
Cr-Commit-Position: refs/heads/master@{#55623}

src/ppc/macro-assembler-ppc.h

@@ -73,8 +73,6 @@ Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2 = no_reg,
 #define ShiftLeft_ sld
 #define ShiftRight_ srd
 #define ShiftRightArith srad
-#define Mul mulld
-#define Div divd
 #else
 #define LoadPX lwzx
 #define LoadPUX lwzux
@@ -88,8 +86,6 @@ Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2 = no_reg,
 #define ShiftLeft_ slw
 #define ShiftRight_ srw
 #define ShiftRightArith sraw
-#define Mul mullw
-#define Div divw
 #endif
 
 class V8_EXPORT_PRIVATE TurboAssembler : public TurboAssemblerBase {

src/s390/macro-assembler-s390.h

@@ -69,7 +69,6 @@ Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2 = no_reg,
 
 // These exist to provide portability between 32 and 64bit
 #if V8_TARGET_ARCH_S390X
-#define Div divd
 
 // The length of the arithmetic operation is the length
 // of the register.