OpenCLProgramContext::getExpGRFSize TotalGRFSize flag check

This commit adds a check for TotalGRFNum flag value before trying to
return the value passed from api option.

Author: smilczek

IGC/Compiler/CISACodeGen/OpenCLKernelCodeGen.cpp

@@ -85,6 +85,10 @@ namespace IGC
     }
 
     uint32_t OpenCLProgramContext::getExpGRFSize() const {
+        if (IGC_GET_FLAG_VALUE(TotalGRFNum))
+        {
+            return IGC_GET_FLAG_VALUE(TotalGRFNum);
+        }
         if (m_InternalOptions.IntelExpGRFSize) {
             return m_InternalOptions.expGRFSize;
         }

IGC/ocloc_tests/Options/total_grf_precendence_over_api_opt.ll

@@ -0,0 +1,23 @@
+;=========================== begin_copyright_notice ============================
+;
+; Copyright (C) 2025 Intel Corporation
+;
+; SPDX-License-Identifier: MIT
+;
+;============================ end_copyright_notice =============================
+
+; REQUIRES: regkeys,pvc-supported,llvm-14-plus
+
+; RUN: llvm-as %s -o %t.bc
+; RUN: ocloc compile -llvm_input -file %t.bc -device pvc -options " -ze-exp-register-file-size=64 -igc_opts 'TotalGRFNum=256,DumpVISAASMToConsole=1'" 2>&1 | FileCheck %s --check-prefixes=CHECK
+
+; Check that IGC_TotalGRFNum flag takes precedence over the value passed with -ze-exp-register-file-size api option.
+
+; CHECK: //Build option: {{.*}} -TotalGRFNum 256
+; CHECK-NOT: //Build option: {{.*}} -TotalGRFNum 64
+
+
+; Typed pointer arg for the purpose of omitting error.
+define spir_kernel void @foo(i8 addrspace(1)* %p1) {
+  ret void
+}