[clang-tidy] Update tests to include opencl-c-base.h

[svenvh]

Summary

After D120254 some clang-tidy tests started failing on release builds.

clang-tidy has been using the -fdeclare-opencl-builtins functionality
since this became the default in clang, so there is no need to include
opencl-c.h.

[svenvh]

After a bit of digging I realized we don't need the explicit include at all anymore.

[svenvh]

Since this is a simple test update I'll commit this now (before code review), to get affected CI back to green. Please let me know if there are any post-commit concerns.

clang-tools-extra/test/clang-tidy/checkers/altera-id-dependent-backward-branch.cpp

-// RUN: %check_clang_tidy %s altera-id-dependent-backward-branch %t -- -header-filter=.* "--" -cl-std=CL1.2 -c --include opencl-c.h
+// RUN: %check_clang_tidy %s altera-id-dependent-backward-branch %t -- -header-filter=.* "--" -cl-std=CL1.2 -c
 
 typedef struct ExampleStruct {
   int IDDepField;
 } ExampleStruct;
 
 void error() {
   // ==== Conditional Expressions ====
   int accumulator = 0;

clang-tools-extra/test/clang-tidy/checkers/altera-single-work-item-barrier.cpp

-// RUN: %check_clang_tidy -check-suffix=OLDCLOLDAOC %s altera-single-work-item-barrier %t -- -header-filter=.* "--" -cl-std=CL1.2 -c --include opencl-c.h -DOLDCLOLDAOC
-// RUN: %check_clang_tidy -check-suffix=NEWCLOLDAOC %s altera-single-work-item-barrier %t -- -header-filter=.* "--" -cl-std=CL2.0 -c --include opencl-c.h -DNEWCLOLDAOC
-// RUN: %check_clang_tidy -check-suffix=OLDCLNEWAOC %s altera-single-work-item-barrier %t -- -config='{CheckOptions: [{key: altera-single-work-item-barrier.AOCVersion, value: 1701}]}' -header-filter=.* "--" -cl-std=CL1.2 -c --include opencl-c.h -DOLDCLNEWAOC
-// RUN: %check_clang_tidy -check-suffix=NEWCLNEWAOC %s altera-single-work-item-barrier %t -- -config='{CheckOptions: [{key: altera-single-work-item-barrier.AOCVersion, value: 1701}]}' -header-filter=.* "--" -cl-std=CL2.0 -c --include opencl-c.h -DNEWCLNEWAOC
+// RUN: %check_clang_tidy -check-suffix=OLDCLOLDAOC %s altera-single-work-item-barrier %t -- -header-filter=.* "--" -cl-std=CL1.2 -c -DOLDCLOLDAOC
+// RUN: %check_clang_tidy -check-suffix=NEWCLOLDAOC %s altera-single-work-item-barrier %t -- -header-filter=.* "--" -cl-std=CL2.0 -c -DNEWCLOLDAOC
+// RUN: %check_clang_tidy -check-suffix=OLDCLNEWAOC %s altera-single-work-item-barrier %t -- -config='{CheckOptions: [{key: altera-single-work-item-barrier.AOCVersion, value: 1701}]}' -header-filter=.* "--" -cl-std=CL1.2 -c -DOLDCLNEWAOC
+// RUN: %check_clang_tidy -check-suffix=NEWCLNEWAOC %s altera-single-work-item-barrier %t -- -config='{CheckOptions: [{key: altera-single-work-item-barrier.AOCVersion, value: 1701}]}' -header-filter=.* "--" -cl-std=CL2.0 -c -DNEWCLNEWAOC
 
 #ifdef OLDCLOLDAOC  // OpenCL 1.2 Altera Offline Compiler < 17.1
 void __kernel error_barrier_no_id(__global int * foo, int size) {
   // CHECK-MESSAGES-OLDCLOLDAOC: :[[@LINE-1]]:15: warning: kernel function 'error_barrier_no_id' does not call 'get_global_id' or 'get_local_id' and will be treated as a single work-item [altera-single-work-item-barrier]
   for (int j = 0; j < 256; j++) {
   for (int i = 256; i < size; i+= 256) {
       foo[j] += foo[j+i];
     }