[compiler] Add relocatable pointer constants for wasm memory references.

src/arm64/assembler-arm64.cc

Index: src/arm64/assembler-arm64.cc
diff --git a/src/arm64/assembler-arm64.cc b/src/arm64/assembler-arm64.cc
index d49c29fa244032c9316b1f70d09d5d9d6a7f5867..16c6e26c7fc1ca2ce2f7c01d52de2457c6fdded2 100644
--- a/src/arm64/assembler-arm64.cc
+++ b/src/arm64/assembler-arm64.cc
@@ -440,7 +440,8 @@ bool ConstPool::CanBeShared(RelocInfo::Mode mode) {
   DCHECK(mode != RelocInfo::NONE32);
 
   return RelocInfo::IsNone(mode) ||
-         (!assm_->serializer_enabled() && (mode >= RelocInfo::CELL));
+         (!assm_->serializer_enabled() &&
+          (mode >= RelocInfo::WASM_MEMORY_REFERENCE));

[Yang, 2016/03/07 06:21:22]

This seems wrong. Previously a RelocInfo::CELL is considered shareable. Now it
no longer is.

Can we introduce a new entry to the enum called
RelocInfo::FIRST_SHAREABLE_RELOC_MODE that is equals to RelocInfo::CELL and use
that?

[gdeepti1, 2016/03/08 04:22:51]

Fixed now - 
https://codereview.chromium.org/1759873002/diff/180001/src/assembler.h
https://codereview.chromium.org/1759873002/diff/180001/src/arm64/assembler-ar...

 }