Revert "fix(jit): GEMM kernels produce NaN under concurrency — missing GDC flags cause PDL synchronization barriers to compile as no-ops" (flashinfer-ai#2737)

Proposing to revert flashinfer-ai#2716 in order to unblock
0.6.6 release

flashinfer-ai#2716 seems to have
broken AOT packages

https://github.com/flashinfer-ai/flashinfer/actions/runs/22870567870/job/66353637447?pr=2730

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

* **Bug Fixes**
* Removed legacy GPU compilation flags related to GDC enablement for
certain GPU tiers during JIT GEMM generation, reducing extra compile
flags and build noise; GDC-related flags for the latest GPU tier remain
enabled where still applicable.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: yzh119 <zihaoy@nvidia.com>
Signed-off-by: Amey Naik <212485788+ameynaik-hub@users.noreply.github.com>

Author: 2 people

flashinfer/jit/gemm/core.py

@@ -91,8 +91,6 @@ def gen_gemm_sm100_module_cutlass_fp4() -> JitSpec:
         + [
             "-DENABLE_BF16",
             "-DENABLE_FP4",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
         ],
         extra_cflags=[
             "-DFAST_BUILD",
@@ -160,8 +158,6 @@ def gen_gemm_sm103_module_cutlass_fp4() -> JitSpec:
         + [
             "-DENABLE_BF16",
             "-DENABLE_FP4",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
         ],
         extra_cflags=[
             "-DFAST_BUILD",
@@ -210,8 +206,6 @@ def gen_gemm_sm120_module_cutlass_fp4() -> JitSpec:
         + [
             "-DENABLE_BF16",
             "-DENABLE_FP4",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
         ],
         extra_cflags=[
             "-DFAST_BUILD",
@@ -262,8 +256,6 @@ def gen_gemm_sm100_module_cutlass_fp8() -> JitSpec:
         extra_cuda_cflags=nvcc_flags
         + [
             "-DENABLE_BF16",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
         ],
         extra_cflags=[
             "-DFAST_BUILD",
@@ -357,8 +349,6 @@ def gen_gemm_sm100_module_cutlass_mxfp8() -> JitSpec:
         extra_cuda_cflags=nvcc_flags
         + [
             "-DENABLE_BF16",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
         ],
         extra_cflags=[
             "-DFAST_BUILD",
@@ -526,11 +516,7 @@ def gen_gemm_sm120_module() -> JitSpec:
     return gen_jit_spec(
         "gemm_sm120",
         source_paths,
-        extra_cuda_cflags=nvcc_flags
-        + [
-            "-DCUTLASS_ENABLE_GDC_FOR_SM100=1",
-            "-DCUTLASS_ENABLE_GDC_FOR_SM90=1",
-        ],
+        extra_cuda_cflags=nvcc_flags,
     )