Ensure PreferredVectorBitWidth is interpreted as a decimal

Author: tannergooding

src/coreclr/jit/compiler.cpp

@@ -2266,7 +2266,7 @@ void Compiler::compSetProcessor()
 // the total sum of flags is still valid.
 #if defined(TARGET_XARCH)
     // Get the preferred vector bitwidth, rounding down to the nearest multiple of 128-bits
-    uint32_t preferredVectorBitWidth   = (JitConfig.PreferredVectorBitWidth() / 128) * 128;
+    uint32_t preferredVectorBitWidth   = (ReinterpretHexAsDecimal(JitConfig.PreferredVectorBitWidth()) / 128) * 128;
     uint32_t preferredVectorByteLength = preferredVectorBitWidth / 8;
 
     if (instructionSetFlags.HasInstructionSet(InstructionSet_SSE))

src/coreclr/jit/jitconfigvalues.h

@@ -299,7 +299,7 @@ CONFIG_INTEGER(JitStressEvexEncoding, W("JitStressEvexEncoding"), 0) // Enable E
 
 // clang-format off
 
-CONFIG_INTEGER(PreferredVectorBitWidth,     W("PreferredVectorBitWidth"),   0) // The preferred width, in bits, to use for any implicit vectorization emitted. A value less than 128 is treated as the system default.
+CONFIG_INTEGER(PreferredVectorBitWidth,     W("PreferredVectorBitWidth"),   0) // The preferred decimal width, in bits, to use for any implicit vectorization emitted. A value less than 128 is treated as the system default.
 
 //
 // Hardware Intrinsic ISAs; keep in sync with clrconfigvalues.h