Strengthen requirements for fixed registers at calls....

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
===================================================================
--- src/arm/lithium-arm.cc	(revision 6717)
+++ src/arm/lithium-arm.cc	(working copy)
@@ -62,8 +62,7 @@
   // Call instructions can use only fixed registers as
   // temporaries and outputs because all registers
   // are blocked by the calling convention.
-  // Inputs can use either fixed register or have a short lifetime (be
-  // used at start of the instruction).
+  // Inputs must use a fixed register.
   ASSERT(Output() == NULL ||
          LUnallocated::cast(Output())->HasFixedPolicy() ||
          !LUnallocated::cast(Output())->HasRegisterPolicy());
@@ -1831,8 +1830,8 @@
 
 
 LInstruction* LChunkBuilder::DoDeleteProperty(HDeleteProperty* instr) {
-  LOperand* object = UseRegisterAtStart(instr->object());
-  LOperand* key = UseRegisterAtStart(instr->key());
+  LOperand* object = UseFixed(instr->object(), r0);
+  LOperand* key = UseFixed(instr->key(), r1);
   LDeleteProperty* result = new LDeleteProperty(object, key);
   return MarkAsCall(DefineFixed(result, r0), instr);
 }
@@ -1880,7 +1879,7 @@
 
 
 LInstruction* LChunkBuilder::DoTypeof(HTypeof* instr) {
-  LTypeof* result = new LTypeof(UseRegisterAtStart(instr->value()));
+  LTypeof* result = new LTypeof(UseFixed(instr->value(), r0));
   return MarkAsCall(DefineFixed(result, r0), instr);
 }