JIT: remove size contribution to perf score (#97069)

Keep the perf score a pure performance metric. Size is emitted as a separate
metric, so clients interested in a metric that is some combination of size
and speed can do their own computations based on these two values.

Resolves #96878.

src/coreclr/jit/codegencommon.cpp

@@ -2002,14 +2002,6 @@ void CodeGen::genEmitMachineCode()
     compiler->compCodeGenDone = true;
 #endif
 
-#if defined(DEBUG) || defined(LATE_DISASM)
-    // Add code size information into the Perf Score
-    // All compPerfScore calculations must be performed using doubles
-    compiler->info.compPerfScore += ((double)compiler->info.compTotalHotCodeSize * (double)PERFSCORE_CODESIZE_COST_HOT);
-    compiler->info.compPerfScore +=
-        ((double)compiler->info.compTotalColdCodeSize * (double)PERFSCORE_CODESIZE_COST_COLD);
-#endif // DEBUG || LATE_DISASM
-
     if (compiler->opts.disAsm && compiler->opts.disTesting)
     {
         printf("; END METHOD %s\n", compiler->eeGetMethodFullName(compiler->info.compMethodHnd));

src/coreclr/jit/emit.h

@@ -1891,11 +1891,6 @@ class emitter
 #define PERFSCORE_MEMORY_WRITE 2
 #define PERFSCORE_MEMORY_READ_WRITE 3
 
-#define PERFSCORE_CODESIZE_COST_HOT 0.10f
-#define PERFSCORE_CODESIZE_COST_COLD 0.01f
-
-#define PERFSCORE_CALLEE_SPILL_COST 0.75f
-
     struct insExecutionCharacteristics
     {
         float    insThroughput;