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Avoid loop having read_tm from getting optimized. #383

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Avoid loop having read_tm from getting optimized. #383

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SagarMaheshwari99
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[AIE2P] Pre-commit 1) frontend test to show loop containing read_tm g…
1e904a6 
…etting vaporized. 2) backend test to show lda.tm getting hoisted.
@SagarMaheshwari99
[AIE2P] read_tm: 1) Change attribute to IntrArgMemOnly to inject "som…
444c29a 
…e volatility" 2) Make load volatile.

This is done to ensure that the loop that continuously polls the TM doesn't get optimized away by LICM.
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