[MIPS][Deserialize] Fix deserialize off heap target.

Change-Id: I3be3dc8815015c0215d3e3d655394850d85db871
Reviewed-on: https://chromium-review.googlesource.com/c/1490812Reviewed-by: Predrag Rudic <prudic@wavecomp.com>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Yu Yin <xwafish@gmail.com>
Cr-Commit-Position: refs/heads/master@{#59997}

src/mips/assembler-mips-inl.h

@@ -123,16 +123,8 @@ Address Assembler::target_address_from_return_address(Address pc) {
 
 void Assembler::deserialization_set_special_target_at(
     Address instruction_payload, Code code, Address target) {
-  if (IsMipsArchVariant(kMips32r6)) {
-    // On R6 the address location is shifted by one instruction
-    set_target_address_at(
-        instruction_payload - (kInstructionsFor32BitConstant - 1) * kInstrSize,
-        !code.is_null() ? code->constant_pool() : kNullAddress, target);
-  } else {
-    set_target_address_at(
-        instruction_payload - kInstructionsFor32BitConstant * kInstrSize,
-        !code.is_null() ? code->constant_pool() : kNullAddress, target);
-  }
+  set_target_address_at(instruction_payload,
+      !code.is_null() ? code->constant_pool() : kNullAddress, target);
 }
 
 int Assembler::deserialization_special_target_size(

src/mips64/assembler-mips64-inl.h

@@ -113,8 +113,7 @@ Address Assembler::target_address_from_return_address(Address pc) {
 
 void Assembler::deserialization_set_special_target_at(
     Address instruction_payload, Code code, Address target) {
-  set_target_address_at(
-      instruction_payload - kInstructionsFor64BitConstant * kInstrSize,
+  set_target_address_at(instruction_payload,
       !code.is_null() ? code->constant_pool() : kNullAddress, target);
 }