PC sampling: online partial PC sampling decoding (#1004)

* PC sampling: online partial PC sampling decoding

PC sampling service decodes a PC sample partially
by replacing the PC with an id of the loaded code object instance
containing PC and the offset of the PC within that code object instance.

* PC sampling: marker records removed

* PC sampling parser: minor doc update in mock

* PC sampling: introducing rocprofiler_pc_t

* NULL value of the code object id introduced.

* Clarifying documenation related to PC offset.

* PC offset documentation improvement

* PC sampling parser benchmark: Reducing the number of samples to recreate half of performance.

source/lib/rocprofiler-sdk/pc_sampling/parser/tests/gfx9test.cpp

@@ -299,7 +299,10 @@ class WaveIssueAndErrorTest : public WaveSnapTest
     {
         rocprofiler_pc_sampling_record_t sample;
         ::memset(&sample, 0, sizeof(sample));
-        sample.pc                      = dispatch->unique_id;
+        // TODO: Since code objects are not mocked, use pc.loaded_code_object_offset
+        // as the absolute physical address of the mocked PC.
+        sample.pc.loaded_code_object_offset = dispatch->unique_id;
+
         sample.correlation_id.internal = dispatch->getMockId().raw;
 
         sample.flags.valid              = valid && !error;