Delete some dead code

Author: SingleAccretion

src/coreclr/jit/emit.cpp

@@ -1357,10 +1357,6 @@ void emitter::emitBegFN(bool hasFramePtr
     ig->igPrev          = nullptr;
 #endif
 
-#ifdef DEBUG
-    emitScratchSigInfo = nullptr;
-#endif // DEBUG
-
     /* Append another group, to start generating the method body */
 
     emitNewIG();

src/coreclr/jit/emit.h

@@ -3623,12 +3623,6 @@ class emitter
                             CORINFO_SIG_INFO*     callSig,       /* IN */
                             CORINFO_METHOD_HANDLE methodHandle); /* IN */
 
-#ifdef DEBUG
-    // This is a scratch buffer used to minimize the number of sig info structs
-    // we have to allocate for recordCallSite.
-    CORINFO_SIG_INFO* emitScratchSigInfo;
-#endif // DEBUG
-
     /************************************************************************/
     /*               Logic to collect and display statistics                */
     /************************************************************************/