gollvm: remove stack_allocation_expression

This function is removed from the frontend (CL 92618).

Change-Id: I856491ac85b7336fcf15ee59a8b3a744237ba008
Reviewed-on: https://go-review.googlesource.com/92619
Reviewed-by: Than McIntosh <thanm@google.com>
diff --git a/bridge/go-llvm.cpp b/bridge/go-llvm.cpp
index 7553a02..9e74b2d 100644
--- a/bridge/go-llvm.cpp
+++ b/bridge/go-llvm.cpp
@@ -1566,14 +1566,6 @@
   return rval;
 }
 
-// Return an expression that allocates SIZE bytes on the stack.
-
-Bexpression *Llvm_backend::stack_allocation_expression(int64_t size,
-                                                       Location location) {
-  assert(false && "Llvm_backend::stack_allocation_expression not yet impl");
-  return nullptr;
-}
-
 Bstatement *Llvm_backend::error_statement()
 {
   errorCount_++;
diff --git a/bridge/go-llvm.h b/bridge/go-llvm.h
index 77cde6a..4f5f4f7 100644
--- a/bridge/go-llvm.h
+++ b/bridge/go-llvm.h
@@ -206,9 +206,6 @@
                                const std::vector<Bexpression *> &args,
                                Bexpression *static_chain,
                                Location);
-
-  Bexpression *stack_allocation_expression(int64_t size, Location);
-
   // Statements.
 
   Bstatement *error_statement();