[clang] [HLSL][RootSignature] Implement Lexing of DescriptorTables (PR #122981)

[Ashley Coleman via cfe-commits]

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@@ -0,0 +1,153 @@
+#include "clang/Parse/ParseHLSLRootSignature.h"
+
+namespace llvm {
+namespace hlsl {
+namespace root_signature {
+
+// Lexer Definitions
+
+static bool IsNumberChar(char C) {
+  // TODO: extend for float support with or without hexadecimal/exponent
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V-FEXrt wrote:

Yep that would be great!

https://github.com/llvm/llvm-project/pull/122981