misc: Fix coding style for enum's opening braces

The systemc dir was not included in this fix.

First it was identified that there were only occurrences
at 0, 1, and 2 levels of indentation (and 2 of 2 spaces,
1 of 3 spaces and 2 of 12 spaces), using:

    grep -nrE --exclude-dir=systemc \
        "^ *enum [A-Za-z].* {$" src/

Then the following commands were run to replace:

    <indent level>enum X ... {

by:

    <indent level>enum X ...
    <indent level>{

Level 0:
    grep -nrl --exclude-dir=systemc \
        "^enum [A-Za-z].* {$" src/ | \
        xargs sed -Ei \
        's/^enum ([A-Za-z].*) \{$/enum \1\n\{/g'

Level 1:
    grep -nrl --exclude-dir=systemc \
        "^    enum [A-Za-z].* {$" src/ | \
        xargs sed -Ei \
        's/^    enum ([A-Za-z].*) \{$/    enum \1\n    \{/g'

and so on.

Change-Id: Ib186cf379049098ceaec20dfe4d1edcedd5f940d
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/43326
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Reviewed-by: Gabe Black <gabe.black@gmail.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/sim/aux_vector.hh

@@ -54,7 +54,8 @@ swap_byte(AuxVector<IntType> av)
     return av;
 }
 
-enum AuxiliaryVectorType {
+enum AuxiliaryVectorType
+{
     M5_AT_NULL = 0,        // End of vector.
     M5_AT_IGNORE = 1,      // Ignored.
     M5_AT_EXECFD = 2,      // File descriptor of program if interpreter used.

src/sim/drain.hh

@@ -68,7 +68,8 @@ class Drainable;
  *
  * @ingroup api_drain
  */
-enum class DrainState {
+enum class DrainState
+{
     Running,  /**< Running normally */
     Draining, /**< Draining buffers pending serialization/handover */
     Drained,  /**< Buffers drained, ready for serialization/handover */

src/sim/fd_entry.hh

@@ -148,7 +148,8 @@ class FileFDEntry: public HBFDEntry
 class PipeFDEntry: public HBFDEntry
 {
   public:
-    enum EndType {
+    enum EndType
+    {
         read = 0,
         write = 1
     };

src/sim/insttracer.hh

@@ -114,7 +114,8 @@ class InstRecord
     /** @ingroup data
      * What size of data was written?
      */
-    enum DataStatus {
+    enum DataStatus
+    {
         DataInvalid = 0,
         DataInt8 = 1,   // set to equal number of bytes
         DataInt16 = 2,

src/sim/mathexpr.hh

@@ -85,7 +85,8 @@ class MathExpr
     }
 
   private:
-    enum Operator {
+    enum Operator
+    {
         bAdd, bSub, bMul, bDiv, bPow, uNeg, sValue, sVariable, nInvalid
     };