SWDEV-527202: Moving ATT to experimental (#335)

* Moving ATT to experimental

* Formatting + rebase

* Addressing review comments

* Formatting

* Update source/lib/att-tool/waitcnt/analysis.cpp

---------

Co-authored-by: Giovanni Baraldi <gbaraldi@amd.com>
Co-authored-by: Madsen, Jonathan <Jonathan.Madsen@amd.com>

[ROCm/rocprofiler-sdk commit: 46818b0167]

projects/rocprofiler-sdk/source/lib/tests/codeobj/hipcc_output.s

@@ -0,0 +1,17 @@
+s_load_b64 s[0:1], s[0:1], 0x0
+s_getreg_b32 s2, hwreg(HW_REG_SHADER_CYCLES, 0, 20)
+s_waitcnt vmcnt(0) lgkmcnt(0)
+s_waitcnt_vscnt null, 0x0
+s_barrier
+s_waitcnt vmcnt(0) lgkmcnt(0)
+s_waitcnt_vscnt null, 0x0
+buffer_gl0_inv
+s_getreg_b32 s3, hwreg(HW_REG_SHADER_CYCLES, 0, 20)
+s_delay_alu instid0(SALU_CYCLE_1) | instskip(SKIP_1) | instid1(SALU_CYCLE_1)
+s_sub_u32 s4, s3, s2
+s_subb_u32 s5, 0, 0
+v_cmp_lt_i64_e64 s3, s[4:5], s[0:1]
+s_delay_alu instid0(VALU_DEP_1)
+s_and_b32 vcc_lo, exec_lo, s3
+s_cbranch_vccnz 65520
+s_endpgm