sim,misc: Rename Float namespace as as_float

As part of recent decisions regarding namespace
naming conventions, all namespaces will be changed
to snake case.

sim_clock::Float became sim_clock::as_float.

"as_float" was chosen because "float" is a reserved
keywords, and this namespace acts as a selector of
how to read the internal variables. Another
possibility to resolve this would be to remove the
namespaces "Float" and "Int" and use unions instead.

Change-Id: I7b3d9c6e9ab547493d5596c7eda080a25509a730
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/45435
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
Maintainer: Gabe Black <gabe.black@gmail.com>

src/cpu/kvm/timer.hh

@@ -129,7 +129,7 @@ class BaseKvmTimer
      * @return Nanoseconds executed in VM converted to simulation ticks
      */
     Tick ticksFromHostNs(uint64_t ns) {
-        return ns * hostFactor * sim_clock::Float::ns;
+        return ns * hostFactor * sim_clock::as_float::ns;
     }
 
   protected:
@@ -147,7 +147,7 @@ class BaseKvmTimer
      * @return Simulation ticks converted into nanoseconds on the host
      */
     uint64_t hostNs(Tick ticks) {
-        return ticks / (sim_clock::Float::ns * hostFactor);
+        return ticks / (sim_clock::as_float::ns * hostFactor);
     }
 
     /**

src/cpu/kvm/x86_cpu.cc

@@ -1248,7 +1248,7 @@ X86KvmCPU::kvmRunDrain()
         // Limit the run to 1 millisecond. That is hopefully enough to
         // reach an interrupt window. Otherwise, we'll just try again
         // later.
-        return BaseKvmCPU::kvmRun(1 * sim_clock::Float::ms);
+        return BaseKvmCPU::kvmRun(1 * sim_clock::as_float::ms);
     } else {
         DPRINTF(Drain, "kvmRunDrain: Delivering pending IO\n");