[heap] Get rid of unused regexp includes.

src/heap/heap.cc

Index: src/heap/heap.cc
diff --git a/src/heap/heap.cc b/src/heap/heap.cc
index 0fd15cff096ab1ee2d107f0d31cc53f1a5de4bba..31a30e88b5f98c59cbf46ba93b4483ba177c4468 100644
--- a/src/heap/heap.cc
+++ b/src/heap/heap.cc
@@ -36,23 +36,6 @@
 #include "src/v8threads.h"
 #include "src/vm-state-inl.h"
 
-#if V8_TARGET_ARCH_PPC && !V8_INTERPRETED_REGEXP
-#include "src/regexp/ppc/regexp-macro-assembler-ppc.h"
-#include "src/regexp/regexp-macro-assembler.h"
-#endif
-#if V8_TARGET_ARCH_ARM && !V8_INTERPRETED_REGEXP
-#include "src/regexp/arm/regexp-macro-assembler-arm.h"
-#include "src/regexp/regexp-macro-assembler.h"
-#endif
-#if V8_TARGET_ARCH_MIPS && !V8_INTERPRETED_REGEXP
-#include "src/regexp/mips/regexp-macro-assembler-mips.h"
-#include "src/regexp/regexp-macro-assembler.h"
-#endif
-#if V8_TARGET_ARCH_MIPS64 && !V8_INTERPRETED_REGEXP
-#include "src/regexp/mips64/regexp-macro-assembler-mips64.h"
-#include "src/regexp/regexp-macro-assembler.h"
-#endif
-
 namespace v8 {
 namespace internal {