Integrate LLVM at 6d847b1aada50d59c3e29f2e7eff779c0ee8182c (#4073)

Update LLVM to
llvm/llvm-project@6d847b1

TOSA Updates Summary:

1: [TOSA] Update tosa.transpose's perms as attributes
Update tosa.transpose's perms to attributes according to TOSA 1.0
Update LIT tests

2: [TOSA] Rename ReduceProd to ReduceProduct
Update ReduceProd name to ReduceProduct in align with TOSA 1.0 spec

3: [TOSA] Change PadOp's pad_const to rank 1
Require PadOp's pad_const to be rank 1 in align with TOSA 1.0 spec

4: [TOSA] Generate correct parameters for conv ops
Bug fix: According to TOSA spec
(https://www.mlplatform.org/tosa/tosa_spec.html#_conv2d), full height
and width values must be divisible by stride values. This commit adds
checks for that divisibility and modifies pad values and/or slices input
to generate TOSA-compliant parameters for convolution ops.

5: [TOSA] Update LIT tests and e2e results

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Signed-off-by: Vivek Khandelwal <vivekkhandelwal1424@gmail.com>
Co-authored-by: Justin Ngo <justin.ngo@arm.com>

Author: vivekkhandelwal1