Fix computation of CFA, return address location, callee save GRF (#6)

location in .debug_frame section used for stack calls.

Author: pratikashar

IGC/Compiler/DebugInfo/ScalarVISAModule.h

@@ -43,6 +43,10 @@ class ScalarVisaModule final : public IGC::VISAModule {
       return m_pShader->getGRFSize();
     }
 
+    unsigned getNumGRFs() const override {
+        return m_pShader->ProgramOutput()->m_numGRFTotal;
+    }
+
     unsigned getPointerSize() const override;
 
     llvm::ArrayRef<char> getGenDebug() const override {