Allow use of lib6_6 profile for DXC compilation. (shader-slang#1520)

Author: jsmall-zzz

source/slang/slang-compiler.cpp

@@ -713,6 +713,7 @@ namespace Slang
         CASE(DX_6_3,             _6_3);
         CASE(DX_6_4,             _6_4);
         CASE(DX_6_5,             _6_5);
+        CASE(DX_6_6,             _6_6);
     #undef CASE
 
         default:

source/slang/slang-profile-defs.h

@@ -103,6 +103,7 @@ PROFILE_VERSION(DX_6_2,             DX)
 PROFILE_VERSION(DX_6_3,             DX)
 PROFILE_VERSION(DX_6_4,             DX)
 PROFILE_VERSION(DX_6_5,             DX)
+PROFILE_VERSION(DX_6_6,             DX)
 
 PROFILE_VERSION(GLSL_110,           GLSL)
 PROFILE_VERSION(GLSL_120,           GLSL)
@@ -208,13 +209,14 @@ PROFILE(DX_Lib_6_2,              lib_6_2,             Unknown, DX_6_2)
 PROFILE(DX_Lib_6_3,              lib_6_3,             Unknown, DX_6_3)
 PROFILE(DX_Lib_6_4,              lib_6_4,             Unknown, DX_6_4)
 PROFILE(DX_Lib_6_5,              lib_6_5,             Unknown, DX_6_5)
+PROFILE(DX_Lib_6_6,              lib_6_6,             Unknown, DX_6_6)
 
 PROFILE_ALIAS(DX_None_6_1,  DX_Lib_6_1,     sm_6_1)
 PROFILE_ALIAS(DX_None_6_2,  DX_Lib_6_2,     sm_6_2)
 PROFILE_ALIAS(DX_None_6_3,  DX_Lib_6_3,     sm_6_3)
 PROFILE_ALIAS(DX_None_6_4,  DX_Lib_6_4,     sm_6_4)
 PROFILE_ALIAS(DX_None_6_5,  DX_Lib_6_5,     sm_6_5)
-
+PROFILE_ALIAS(DX_None_6_6,  DX_Lib_6_6,     sm_6_6)
 
 // Define all the GLSL profiles