PPC: [wasm] Fixes for embedded constant pools.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index 8ceb159534d8ca56c6c2cdb847a65dd6f1a9c983..d499f5dcb8f194845eeb3815b07870807fd1eef2 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -1544,8 +1544,11 @@ void CodeGenerator::AssemblePrologue() {
     }
   } else if (descriptor->IsJSFunctionCall()) {
     CompilationInfo* info = this->info();
-    __ Prologue(info->IsCodePreAgingActive());
+    __ Prologue(info->IsCodePreAgingActive(), ip);
   } else if (frame()->needs_frame()) {
+    // TODO(mbrandy): Detect the case where we're not generating an
+    // exported wasm function -- so that we can leverage ip to set up
+    // the constant pool pointer register (via StubPrologue(ip)).
     __ StubPrologue();

[MTBrandyberry, 2016/01/11 18:10:04]

wasm owners: Is there a condition would would detect compilation of an exported
wasm routine?  This change makes the prologue more expensive so would like to
limit if possible.

   } else {
     frame()->SetElidedFrameSizeInSlots(0);