[SM6.10] Add Matrix class methods and other LinAlg API to linalg.h (#8299)

Implements `Matrix` class methods and other API functions related to linear algebra as specified in LinAlg spec
[here](https://github.com/microsoft/hlsl-specs/blob/main/proposals/0035-linalg-matrix.md#appendix-1-hlsl-header).

The header disables warning when an argument is marked as `groupshared` which is reported when the language version is other than 202x. In order to do that the warning needed to be moved to a separate diagnostic group. Also fixes couple of places in SemaHLSL that did not account for the linalg matrix type.

Related to #7839

Author: hekota

tools/clang/include/clang/Basic/DiagnosticGroups.td

@@ -807,4 +807,5 @@ def HLSLAvailability: DiagGroup<"hlsl-availability">;
 def HLSLAvailabilityConstant: DiagGroup<"hlsl-availability-constant">;
 def HLSLBarrier : DiagGroup<"hlsl-barrier">;
 def HLSLLegacyLiterals : DiagGroup<"hlsl-legacy-literal">;
+def HLSLGroupshared202x : DiagGroup<"hlsl-groupshared-202x">;
 // HLSL Change Ends

tools/clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -1597,9 +1597,10 @@ def warn_hlsl_sometimes_uninit_out_param : Warning<
   "its declaration is reached|"
   "%3 is called}2">,
   InGroup<HLSLParameterUsage>;
-def warn_hlsl_groupshared_202x: Warning<
-  "Support for groupshared parameter annotation not added until HLSL 202x">,
-  InGroup<HLSLParameterUsage>;
+def warn_hlsl_groupshared_202x
+    : Warning<"Support for groupshared parameter annotation not added until "
+              "HLSL 202x">,
+      InGroup<HLSLGroupshared202x>;
 def warn_hlsl_groupshared_inout: Warning<
   "Passing groupshared variable to a parameter annotated with inout. See "
   "'groupshared' parameter annotation added in 202x.">,