SpirvShader: Simplify the logic around the generation of the inner loop.
SpirvShader: Simplify the logic around the generation of the inner loop.

The 'existsPath' condition is not required, and worse still breaks some future
fixes.

Bug: b/133440380
Bug: b/133481698
Change-Id: I9c5d20bf7782443b0e0e3eb0aacebae251687164
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/32048
Presubmit-Ready: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader