clc: relax spec constant validation

Multiple values can have multiple spec constants assigned and vtn handles
this just fine. So just drop that assert as we need it to run SyCL
kernels.

Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/9037
Fixes: a699844ffb ("microsoft/clc: Parse SPIR-V specialization consts into metadata")
Signed-off-by: Karol Herbst <git@karolherbst.de>
Acked-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23512>
(cherry picked from commit 90b8666ff2)

.pick_status.json

@@ -3271,7 +3271,7 @@
         "description": "clc: relax spec constant validation",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": "a699844ffba20fb0bfe7103eb70938bac604748e"
     },

src/compiler/clc/clc_helpers.cpp

@@ -338,7 +338,6 @@ public:
          uint32_t spec_id = ins->words[ins->operands[2].offset];
          for (auto &c : specConstants) {
             if (c.second.id == spec_id) {
-               assert(c.first == id);
                return;
             }
          }