PPC: This CL also adds hydrogen stubs for global loads and global stores,...

PPC: This CL also adds hydrogen stubs for global loads and global stores, full-codegen and TurboFan now uses this machinery.

Fix f87286e2

R=ishell@chromium.org, dstence@us.ibm.com, michael_dawson@ca.ibm.com

Original commit message:
    Loads and stores to global vars are now made via property cell shortcuts installed into parent script context.

BUG=

Review URL: https://codereview.chromium.org/1228393005

Cr-Commit-Position: refs/heads/master@{#29619}

src/ppc/interface-descriptors-ppc.cc

@@ -38,7 +38,7 @@ const Register StoreTransitionDescriptor::MapRegister() { return r6; }
 
 const Register LoadGlobalViaContextDescriptor::DepthRegister() { return r4; }
 const Register LoadGlobalViaContextDescriptor::SlotRegister() { return r5; }
-const Register LoadGlobalViaContextDescriptor::NameRegister() { return r3; }
+const Register LoadGlobalViaContextDescriptor::NameRegister() { return r6; }
 
 
 const Register StoreGlobalViaContextDescriptor::DepthRegister() { return r4; }