For-loop in always block and generate-for-loop with same index causing issues

Summary

When having two separate for loops, one in an always-block, and one in a generate, using the same name for the index variable, the generate loop replicates the indexes with A, B, C suffix.

Steps to reproduce

In commit e124a2cc see file forloop_generate03.sv.

cd test/systemverilog
../../bin/tmrg forloop_generate03.sv
iverilog -g2012 forloop_generate03TMR.sv

What is the current bug behavior

The assignment in the generate-for-loop uses <genvar index>A, <genvar index>B, <genvar index>C.

What is the correct behavior

The assignment in the generate-for-loop uses <genvar index>.

Additional information

• verible passes for this block (due to https://github.com/chipsalliance/verible/issues/1161)
• iverilog recognizes the incorrect syntax, but the CI passes either iverilog or verible pass.
• Using a different index name solves the issue.