fix IGNORE_OOB=0 for WEBGPU (#13926)

.github/workflows/test.yml

@@ -584,6 +584,8 @@ jobs:
     name: Linux (WebGPU)
     runs-on: ubuntu-22.04
     timeout-minutes: 20
+    env:
+      IGNORE_OOB: 0
     steps:
     - name: Checkout Code
       uses: actions/checkout@v4
@@ -829,6 +831,8 @@ jobs:
     name: MacOS (WebGPU)
     runs-on: macos-14
     timeout-minutes: 10
+    env:
+      IGNORE_OOB: 0
     steps:
     - name: Checkout Code
       uses: actions/checkout@v4
@@ -906,6 +910,8 @@ jobs:
     name: Windows (${{ matrix.backend }})
     runs-on: windows-latest
     timeout-minutes: 15
+    env:
+      IGNORE_OOB: 0
     steps:
       - name: Checkout Code
         uses: actions/checkout@v4

tinygrad/uop/validate.py

@@ -68,7 +68,7 @@ def validate_index(buf:UOp, idx:UOp, gate:UOp|None=None):
   if 0<=idx.vmin and idx.vmax<sz: return True
 
   # WEBGPU has a BITCAST in the index. TODO: fix
-  if any(x.op is Ops.BITCAST for x in idx.toposort()): return True
+  if any(x.op is Ops.BITCAST for x in idx.toposort() | gate.toposort()): return True
 
   if not z3_imported: raise ImportError("bounds checking requires z3 >= 4.12.4, use IGNORE_OOB=1 to disable, or \"pip install 'z3-solver>=4.12.4\"")
   solver = z3.Solver(ctx=z3.Context())