[trap-handler] Remove obsolete base pointer update.

Now that WebAssembly code has moved off the garbage collected heap, it
is no longer subject to relocation and support for updating the base
address for the purposes of trap handling can be removed.

R=eholk@chromium.org
BUG=v8:7549

Change-Id: I7a98f192e0c91274fa2ccdb59cdd106da6217948
Reviewed-on: https://chromium-review.googlesource.com/978248Reviewed-by: Eric Holk <eholk@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52207}

src/trap-handler/handler-outside.cc

@@ -135,15 +135,6 @@ CodeProtectionInfo* CreateHandlerData(
   return data;
 }
 
-void UpdateHandlerDataCodePointer(int index, void* base) {
-  MetadataLock lock;
-  if (static_cast<size_t>(index) >= gNumCodeObjects) {
-    abort();
-  }
-  CodeProtectionInfo* data = gCodeObjects[index].code_info;
-  data->base = base;
-}
-
 int RegisterHandlerData(
     void* base, size_t size, size_t num_protected_instructions,
     const ProtectedInstructionData* protected_instructions) {

src/trap-handler/trap-handler.h

@@ -41,20 +41,17 @@ struct ProtectedInstructionData {
 
 const int kInvalidIndex = -1;
 
-/// Adjusts the base code pointer.
-void UpdateHandlerDataCodePointer(int index, void* base);
-
 /// Adds the handler data to the place where the signal handler will find it.
 ///
 /// This returns a number that can be used to identify the handler data to
-/// UpdateHandlerDataCodePointer and ReleaseHandlerData, or -1 on failure.
+/// ReleaseHandlerData, or -1 on failure.
 int RegisterHandlerData(void* base, size_t size,
                         size_t num_protected_instructions,
                         const ProtectedInstructionData* protected_instructions);
 
 /// Removes the data from the master list and frees any memory, if necessary.
-/// TODO(mtrofin): once FLAG_wasm_jit_to_native is not needed, we can switch
-/// to using size_t for index and not need kInvalidIndex.
+/// TODO(mtrofin): We can switch to using size_t for index and not need
+/// kInvalidIndex.
 void ReleaseHandlerData(int index);
 
 #if V8_OS_WIN