Remove unnecessary comments and debug code

Author: khushal1996

src/coreclr/debug/inc/dbgtargetcontext.h

@@ -256,31 +256,6 @@ typedef struct DECLSPEC_ALIGN(16) {
     DWORD64 R14;
     DWORD64 R15;
 
-// #if defined(TARGET_UNIX)
-//     //EGPRs for APX
-//     union {
-//         struct {
-//             DWORD64 R16;
-//             DWORD64 R17;
-//             DWORD64 R18;
-//             DWORD64 R19;
-//             DWORD64 R20;
-//             DWORD64 R21;
-//             DWORD64 R22;
-//             DWORD64 R23;
-//             DWORD64 R24;
-//             DWORD64 R25;
-//             DWORD64 R26;
-//             DWORD64 R27;
-//             DWORD64 R28;
-//             DWORD64 R29;
-//             DWORD64 R30;
-//             DWORD64 R31;
-//         };
-//         DWORD64 R[16];
-//     };
-// #endif // TARGET_UNIX
-
     DWORD64 Rip;
 
     union {

src/coreclr/vm/amd64/cgenamd64.cpp

@@ -179,22 +179,8 @@ void FaultingExceptionFrame::UpdateRegDisplay_Impl(const PREGDISPLAY pRD, bool u
     pRD->pCurrentContextPointers->R13 = &m_ctx.R13;
     pRD->pCurrentContextPointers->R14 = &m_ctx.R14;
     pRD->pCurrentContextPointers->R15 = &m_ctx.R15;
-    // pRD->pCurrentContextPointers->R16 = &m_ctx.R16;
-    // pRD->pCurrentContextPointers->R17 = &m_ctx.R17;
-    // pRD->pCurrentContextPointers->R18 = &m_ctx.R18;
-    // pRD->pCurrentContextPointers->R19 = &m_ctx.R19;
-    // pRD->pCurrentContextPointers->R20 = &m_ctx.R20;
-    // pRD->pCurrentContextPointers->R21 = &m_ctx.R21;
-    // pRD->pCurrentContextPointers->R22 = &m_ctx.R22;
-    // pRD->pCurrentContextPointers->R23 = &m_ctx.R23;
-    // pRD->pCurrentContextPointers->R24 = &m_ctx.R24;
-    // pRD->pCurrentContextPointers->R25 = &m_ctx.R25;
-    // pRD->pCurrentContextPointers->R26 = &m_ctx.R26;
-    // pRD->pCurrentContextPointers->R27 = &m_ctx.R27;
-    // pRD->pCurrentContextPointers->R28 = &m_ctx.R28;
-    // pRD->pCurrentContextPointers->R29 = &m_ctx.R29;
-    // pRD->pCurrentContextPointers->R30 = &m_ctx.R30;
-    // pRD->pCurrentContextPointers->R31 = &m_ctx.R31;
+
+    // TBD APX: Do we need to update the EGPR context?
 
     pRD->IsCallerContextValid = FALSE;
     pRD->IsCallerSPValid      = FALSE;        // Don't add usage of this field.  This is only temporary.